One man was dead and another missing after an unmanned speedboat was discovered spinning in circles about a quarter mile from the Half Moon Bay harbor, according to authorities.

A 17-foot Boston Whaler was spotted off of Martin’s Beach around 1:49 p.m Sunday.

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The Coast Guard said that a body was pulled out of the water about 5 p.m., and that a search has been launched for a second person believed to be aboard the boat. While the boaters have been identified, their names were not being released.

Petty Officer Cory Mendenhall said the U.S. Coast Guard got reports of a boat “doing doughnuts” offshore south of Pillar Point. Authorities let the boat run out of gas before towing it away.

The boat is registered to someone in Vallejo, according to news reports.